FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_mount.c
1 /*-
2 * Copyright (c) 1999-2004 Poul-Henning Kamp
3 * Copyright (c) 1999 Michael Smith
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD: releng/11.1/sys/kern/vfs_mount.c 311957 2017-01-12 01:09:15Z kib $");
39
40 #include <sys/param.h>
41 #include <sys/conf.h>
42 #include <sys/fcntl.h>
43 #include <sys/jail.h>
44 #include <sys/kernel.h>
45 #include <sys/libkern.h>
46 #include <sys/malloc.h>
47 #include <sys/mount.h>
48 #include <sys/mutex.h>
49 #include <sys/namei.h>
50 #include <sys/priv.h>
51 #include <sys/proc.h>
52 #include <sys/filedesc.h>
53 #include <sys/reboot.h>
54 #include <sys/sbuf.h>
55 #include <sys/syscallsubr.h>
56 #include <sys/sysproto.h>
57 #include <sys/sx.h>
58 #include <sys/sysctl.h>
59 #include <sys/sysent.h>
60 #include <sys/systm.h>
61 #include <sys/vnode.h>
62 #include <vm/uma.h>
63
64 #include <geom/geom.h>
65
66 #include <machine/stdarg.h>
67
68 #include <security/audit/audit.h>
69 #include <security/mac/mac_framework.h>
70
71 #define VFS_MOUNTARG_SIZE_MAX (1024 * 64)
72
73 static int vfs_domount(struct thread *td, const char *fstype, char *fspath,
74 uint64_t fsflags, struct vfsoptlist **optlist);
75 static void free_mntarg(struct mntarg *ma);
76
77 static int usermount = 0;
78 SYSCTL_INT(_vfs, OID_AUTO, usermount, CTLFLAG_RW, &usermount, 0,
79 "Unprivileged users may mount and unmount file systems");
80
81 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount structure");
82 MALLOC_DEFINE(M_STATFS, "statfs", "statfs structure");
83 static uma_zone_t mount_zone;
84
85 /* List of mounted filesystems. */
86 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist);
87
88 /* For any iteration/modification of mountlist */
89 struct mtx mountlist_mtx;
90 MTX_SYSINIT(mountlist, &mountlist_mtx, "mountlist", MTX_DEF);
91
92 /*
93 * Global opts, taken by all filesystems
94 */
95 static const char *global_opts[] = {
96 "errmsg",
97 "fstype",
98 "fspath",
99 "ro",
100 "rw",
101 "nosuid",
102 "noexec",
103 NULL
104 };
105
106 static int
107 mount_init(void *mem, int size, int flags)
108 {
109 struct mount *mp;
110
111 mp = (struct mount *)mem;
112 mtx_init(&mp->mnt_mtx, "struct mount mtx", NULL, MTX_DEF);
113 lockinit(&mp->mnt_explock, PVFS, "explock", 0, 0);
114 return (0);
115 }
116
117 static void
118 mount_fini(void *mem, int size)
119 {
120 struct mount *mp;
121
122 mp = (struct mount *)mem;
123 lockdestroy(&mp->mnt_explock);
124 mtx_destroy(&mp->mnt_mtx);
125 }
126
127 static void
128 vfs_mount_init(void *dummy __unused)
129 {
130
131 mount_zone = uma_zcreate("Mountpoints", sizeof(struct mount), NULL,
132 NULL, mount_init, mount_fini, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
133 }
134 SYSINIT(vfs_mount, SI_SUB_VFS, SI_ORDER_ANY, vfs_mount_init, NULL);
135
136 /*
137 * ---------------------------------------------------------------------
138 * Functions for building and sanitizing the mount options
139 */
140
141 /* Remove one mount option. */
142 static void
143 vfs_freeopt(struct vfsoptlist *opts, struct vfsopt *opt)
144 {
145
146 TAILQ_REMOVE(opts, opt, link);
147 free(opt->name, M_MOUNT);
148 if (opt->value != NULL)
149 free(opt->value, M_MOUNT);
150 free(opt, M_MOUNT);
151 }
152
153 /* Release all resources related to the mount options. */
154 void
155 vfs_freeopts(struct vfsoptlist *opts)
156 {
157 struct vfsopt *opt;
158
159 while (!TAILQ_EMPTY(opts)) {
160 opt = TAILQ_FIRST(opts);
161 vfs_freeopt(opts, opt);
162 }
163 free(opts, M_MOUNT);
164 }
165
166 void
167 vfs_deleteopt(struct vfsoptlist *opts, const char *name)
168 {
169 struct vfsopt *opt, *temp;
170
171 if (opts == NULL)
172 return;
173 TAILQ_FOREACH_SAFE(opt, opts, link, temp) {
174 if (strcmp(opt->name, name) == 0)
175 vfs_freeopt(opts, opt);
176 }
177 }
178
179 static int
180 vfs_isopt_ro(const char *opt)
181 {
182
183 if (strcmp(opt, "ro") == 0 || strcmp(opt, "rdonly") == 0 ||
184 strcmp(opt, "norw") == 0)
185 return (1);
186 return (0);
187 }
188
189 static int
190 vfs_isopt_rw(const char *opt)
191 {
192
193 if (strcmp(opt, "rw") == 0 || strcmp(opt, "noro") == 0)
194 return (1);
195 return (0);
196 }
197
198 /*
199 * Check if options are equal (with or without the "no" prefix).
200 */
201 static int
202 vfs_equalopts(const char *opt1, const char *opt2)
203 {
204 char *p;
205
206 /* "opt" vs. "opt" or "noopt" vs. "noopt" */
207 if (strcmp(opt1, opt2) == 0)
208 return (1);
209 /* "noopt" vs. "opt" */
210 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
211 return (1);
212 /* "opt" vs. "noopt" */
213 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
214 return (1);
215 while ((p = strchr(opt1, '.')) != NULL &&
216 !strncmp(opt1, opt2, ++p - opt1)) {
217 opt2 += p - opt1;
218 opt1 = p;
219 /* "foo.noopt" vs. "foo.opt" */
220 if (strncmp(opt1, "no", 2) == 0 && strcmp(opt1 + 2, opt2) == 0)
221 return (1);
222 /* "foo.opt" vs. "foo.noopt" */
223 if (strncmp(opt2, "no", 2) == 0 && strcmp(opt1, opt2 + 2) == 0)
224 return (1);
225 }
226 /* "ro" / "rdonly" / "norw" / "rw" / "noro" */
227 if ((vfs_isopt_ro(opt1) || vfs_isopt_rw(opt1)) &&
228 (vfs_isopt_ro(opt2) || vfs_isopt_rw(opt2)))
229 return (1);
230 return (0);
231 }
232
233 /*
234 * If a mount option is specified several times,
235 * (with or without the "no" prefix) only keep
236 * the last occurrence of it.
237 */
238 static void
239 vfs_sanitizeopts(struct vfsoptlist *opts)
240 {
241 struct vfsopt *opt, *opt2, *tmp;
242
243 TAILQ_FOREACH_REVERSE(opt, opts, vfsoptlist, link) {
244 opt2 = TAILQ_PREV(opt, vfsoptlist, link);
245 while (opt2 != NULL) {
246 if (vfs_equalopts(opt->name, opt2->name)) {
247 tmp = TAILQ_PREV(opt2, vfsoptlist, link);
248 vfs_freeopt(opts, opt2);
249 opt2 = tmp;
250 } else {
251 opt2 = TAILQ_PREV(opt2, vfsoptlist, link);
252 }
253 }
254 }
255 }
256
257 /*
258 * Build a linked list of mount options from a struct uio.
259 */
260 int
261 vfs_buildopts(struct uio *auio, struct vfsoptlist **options)
262 {
263 struct vfsoptlist *opts;
264 struct vfsopt *opt;
265 size_t memused, namelen, optlen;
266 unsigned int i, iovcnt;
267 int error;
268
269 opts = malloc(sizeof(struct vfsoptlist), M_MOUNT, M_WAITOK);
270 TAILQ_INIT(opts);
271 memused = 0;
272 iovcnt = auio->uio_iovcnt;
273 for (i = 0; i < iovcnt; i += 2) {
274 namelen = auio->uio_iov[i].iov_len;
275 optlen = auio->uio_iov[i + 1].iov_len;
276 memused += sizeof(struct vfsopt) + optlen + namelen;
277 /*
278 * Avoid consuming too much memory, and attempts to overflow
279 * memused.
280 */
281 if (memused > VFS_MOUNTARG_SIZE_MAX ||
282 optlen > VFS_MOUNTARG_SIZE_MAX ||
283 namelen > VFS_MOUNTARG_SIZE_MAX) {
284 error = EINVAL;
285 goto bad;
286 }
287
288 opt = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
289 opt->name = malloc(namelen, M_MOUNT, M_WAITOK);
290 opt->value = NULL;
291 opt->len = 0;
292 opt->pos = i / 2;
293 opt->seen = 0;
294
295 /*
296 * Do this early, so jumps to "bad" will free the current
297 * option.
298 */
299 TAILQ_INSERT_TAIL(opts, opt, link);
300
301 if (auio->uio_segflg == UIO_SYSSPACE) {
302 bcopy(auio->uio_iov[i].iov_base, opt->name, namelen);
303 } else {
304 error = copyin(auio->uio_iov[i].iov_base, opt->name,
305 namelen);
306 if (error)
307 goto bad;
308 }
309 /* Ensure names are null-terminated strings. */
310 if (namelen == 0 || opt->name[namelen - 1] != '\0') {
311 error = EINVAL;
312 goto bad;
313 }
314 if (optlen != 0) {
315 opt->len = optlen;
316 opt->value = malloc(optlen, M_MOUNT, M_WAITOK);
317 if (auio->uio_segflg == UIO_SYSSPACE) {
318 bcopy(auio->uio_iov[i + 1].iov_base, opt->value,
319 optlen);
320 } else {
321 error = copyin(auio->uio_iov[i + 1].iov_base,
322 opt->value, optlen);
323 if (error)
324 goto bad;
325 }
326 }
327 }
328 vfs_sanitizeopts(opts);
329 *options = opts;
330 return (0);
331 bad:
332 vfs_freeopts(opts);
333 return (error);
334 }
335
336 /*
337 * Merge the old mount options with the new ones passed
338 * in the MNT_UPDATE case.
339 *
340 * XXX: This function will keep a "nofoo" option in the new
341 * options. E.g, if the option's canonical name is "foo",
342 * "nofoo" ends up in the mount point's active options.
343 */
344 static void
345 vfs_mergeopts(struct vfsoptlist *toopts, struct vfsoptlist *oldopts)
346 {
347 struct vfsopt *opt, *new;
348
349 TAILQ_FOREACH(opt, oldopts, link) {
350 new = malloc(sizeof(struct vfsopt), M_MOUNT, M_WAITOK);
351 new->name = strdup(opt->name, M_MOUNT);
352 if (opt->len != 0) {
353 new->value = malloc(opt->len, M_MOUNT, M_WAITOK);
354 bcopy(opt->value, new->value, opt->len);
355 } else
356 new->value = NULL;
357 new->len = opt->len;
358 new->seen = opt->seen;
359 TAILQ_INSERT_HEAD(toopts, new, link);
360 }
361 vfs_sanitizeopts(toopts);
362 }
363
364 /*
365 * Mount a filesystem.
366 */
367 int
368 sys_nmount(td, uap)
369 struct thread *td;
370 struct nmount_args /* {
371 struct iovec *iovp;
372 unsigned int iovcnt;
373 int flags;
374 } */ *uap;
375 {
376 struct uio *auio;
377 int error;
378 u_int iovcnt;
379 uint64_t flags;
380
381 /*
382 * Mount flags are now 64-bits. On 32-bit archtectures only
383 * 32-bits are passed in, but from here on everything handles
384 * 64-bit flags correctly.
385 */
386 flags = uap->flags;
387
388 AUDIT_ARG_FFLAGS(flags);
389 CTR4(KTR_VFS, "%s: iovp %p with iovcnt %d and flags %d", __func__,
390 uap->iovp, uap->iovcnt, flags);
391
392 /*
393 * Filter out MNT_ROOTFS. We do not want clients of nmount() in
394 * userspace to set this flag, but we must filter it out if we want
395 * MNT_UPDATE on the root file system to work.
396 * MNT_ROOTFS should only be set by the kernel when mounting its
397 * root file system.
398 */
399 flags &= ~MNT_ROOTFS;
400
401 iovcnt = uap->iovcnt;
402 /*
403 * Check that we have an even number of iovec's
404 * and that we have at least two options.
405 */
406 if ((iovcnt & 1) || (iovcnt < 4)) {
407 CTR2(KTR_VFS, "%s: failed for invalid iovcnt %d", __func__,
408 uap->iovcnt);
409 return (EINVAL);
410 }
411
412 error = copyinuio(uap->iovp, iovcnt, &auio);
413 if (error) {
414 CTR2(KTR_VFS, "%s: failed for invalid uio op with %d errno",
415 __func__, error);
416 return (error);
417 }
418 error = vfs_donmount(td, flags, auio);
419
420 free(auio, M_IOV);
421 return (error);
422 }
423
424 /*
425 * ---------------------------------------------------------------------
426 * Various utility functions
427 */
428
429 void
430 vfs_ref(struct mount *mp)
431 {
432
433 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
434 MNT_ILOCK(mp);
435 MNT_REF(mp);
436 MNT_IUNLOCK(mp);
437 }
438
439 void
440 vfs_rel(struct mount *mp)
441 {
442
443 CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
444 MNT_ILOCK(mp);
445 MNT_REL(mp);
446 MNT_IUNLOCK(mp);
447 }
448
449 /*
450 * Allocate and initialize the mount point struct.
451 */
452 struct mount *
453 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp, const char *fspath,
454 struct ucred *cred)
455 {
456 struct mount *mp;
457
458 mp = uma_zalloc(mount_zone, M_WAITOK);
459 bzero(&mp->mnt_startzero,
460 __rangeof(struct mount, mnt_startzero, mnt_endzero));
461 TAILQ_INIT(&mp->mnt_nvnodelist);
462 mp->mnt_nvnodelistsize = 0;
463 TAILQ_INIT(&mp->mnt_activevnodelist);
464 mp->mnt_activevnodelistsize = 0;
465 mp->mnt_ref = 0;
466 (void) vfs_busy(mp, MBF_NOWAIT);
467 atomic_add_acq_int(&vfsp->vfc_refcount, 1);
468 mp->mnt_op = vfsp->vfc_vfsops;
469 mp->mnt_vfc = vfsp;
470 mp->mnt_stat.f_type = vfsp->vfc_typenum;
471 mp->mnt_gen++;
472 strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
473 mp->mnt_vnodecovered = vp;
474 mp->mnt_cred = crdup(cred);
475 mp->mnt_stat.f_owner = cred->cr_uid;
476 strlcpy(mp->mnt_stat.f_mntonname, fspath, MNAMELEN);
477 mp->mnt_iosize_max = DFLTPHYS;
478 #ifdef MAC
479 mac_mount_init(mp);
480 mac_mount_create(cred, mp);
481 #endif
482 arc4rand(&mp->mnt_hashseed, sizeof mp->mnt_hashseed, 0);
483 TAILQ_INIT(&mp->mnt_uppers);
484 return (mp);
485 }
486
487 /*
488 * Destroy the mount struct previously allocated by vfs_mount_alloc().
489 */
490 void
491 vfs_mount_destroy(struct mount *mp)
492 {
493
494 MNT_ILOCK(mp);
495 mp->mnt_kern_flag |= MNTK_REFEXPIRE;
496 if (mp->mnt_kern_flag & MNTK_MWAIT) {
497 mp->mnt_kern_flag &= ~MNTK_MWAIT;
498 wakeup(mp);
499 }
500 while (mp->mnt_ref)
501 msleep(mp, MNT_MTX(mp), PVFS, "mntref", 0);
502 KASSERT(mp->mnt_ref == 0,
503 ("%s: invalid refcount in the drain path @ %s:%d", __func__,
504 __FILE__, __LINE__));
505 if (mp->mnt_writeopcount != 0)
506 panic("vfs_mount_destroy: nonzero writeopcount");
507 if (mp->mnt_secondary_writes != 0)
508 panic("vfs_mount_destroy: nonzero secondary_writes");
509 atomic_subtract_rel_int(&mp->mnt_vfc->vfc_refcount, 1);
510 if (!TAILQ_EMPTY(&mp->mnt_nvnodelist)) {
511 struct vnode *vp;
512
513 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes)
514 vn_printf(vp, "dangling vnode ");
515 panic("unmount: dangling vnode");
516 }
517 KASSERT(TAILQ_EMPTY(&mp->mnt_uppers), ("mnt_uppers"));
518 if (mp->mnt_nvnodelistsize != 0)
519 panic("vfs_mount_destroy: nonzero nvnodelistsize");
520 if (mp->mnt_activevnodelistsize != 0)
521 panic("vfs_mount_destroy: nonzero activevnodelistsize");
522 if (mp->mnt_lockref != 0)
523 panic("vfs_mount_destroy: nonzero lock refcount");
524 MNT_IUNLOCK(mp);
525 #ifdef MAC
526 mac_mount_destroy(mp);
527 #endif
528 if (mp->mnt_opt != NULL)
529 vfs_freeopts(mp->mnt_opt);
530 crfree(mp->mnt_cred);
531 uma_zfree(mount_zone, mp);
532 }
533
534 int
535 vfs_donmount(struct thread *td, uint64_t fsflags, struct uio *fsoptions)
536 {
537 struct vfsoptlist *optlist;
538 struct vfsopt *opt, *tmp_opt;
539 char *fstype, *fspath, *errmsg;
540 int error, fstypelen, fspathlen, errmsg_len, errmsg_pos;
541
542 errmsg = fspath = NULL;
543 errmsg_len = fspathlen = 0;
544 errmsg_pos = -1;
545
546 error = vfs_buildopts(fsoptions, &optlist);
547 if (error)
548 return (error);
549
550 if (vfs_getopt(optlist, "errmsg", (void **)&errmsg, &errmsg_len) == 0)
551 errmsg_pos = vfs_getopt_pos(optlist, "errmsg");
552
553 /*
554 * We need these two options before the others,
555 * and they are mandatory for any filesystem.
556 * Ensure they are NUL terminated as well.
557 */
558 fstypelen = 0;
559 error = vfs_getopt(optlist, "fstype", (void **)&fstype, &fstypelen);
560 if (error || fstype[fstypelen - 1] != '\0') {
561 error = EINVAL;
562 if (errmsg != NULL)
563 strncpy(errmsg, "Invalid fstype", errmsg_len);
564 goto bail;
565 }
566 fspathlen = 0;
567 error = vfs_getopt(optlist, "fspath", (void **)&fspath, &fspathlen);
568 if (error || fspath[fspathlen - 1] != '\0') {
569 error = EINVAL;
570 if (errmsg != NULL)
571 strncpy(errmsg, "Invalid fspath", errmsg_len);
572 goto bail;
573 }
574
575 /*
576 * We need to see if we have the "update" option
577 * before we call vfs_domount(), since vfs_domount() has special
578 * logic based on MNT_UPDATE. This is very important
579 * when we want to update the root filesystem.
580 */
581 TAILQ_FOREACH_SAFE(opt, optlist, link, tmp_opt) {
582 if (strcmp(opt->name, "update") == 0) {
583 fsflags |= MNT_UPDATE;
584 vfs_freeopt(optlist, opt);
585 }
586 else if (strcmp(opt->name, "async") == 0)
587 fsflags |= MNT_ASYNC;
588 else if (strcmp(opt->name, "force") == 0) {
589 fsflags |= MNT_FORCE;
590 vfs_freeopt(optlist, opt);
591 }
592 else if (strcmp(opt->name, "reload") == 0) {
593 fsflags |= MNT_RELOAD;
594 vfs_freeopt(optlist, opt);
595 }
596 else if (strcmp(opt->name, "multilabel") == 0)
597 fsflags |= MNT_MULTILABEL;
598 else if (strcmp(opt->name, "noasync") == 0)
599 fsflags &= ~MNT_ASYNC;
600 else if (strcmp(opt->name, "noatime") == 0)
601 fsflags |= MNT_NOATIME;
602 else if (strcmp(opt->name, "atime") == 0) {
603 free(opt->name, M_MOUNT);
604 opt->name = strdup("nonoatime", M_MOUNT);
605 }
606 else if (strcmp(opt->name, "noclusterr") == 0)
607 fsflags |= MNT_NOCLUSTERR;
608 else if (strcmp(opt->name, "clusterr") == 0) {
609 free(opt->name, M_MOUNT);
610 opt->name = strdup("nonoclusterr", M_MOUNT);
611 }
612 else if (strcmp(opt->name, "noclusterw") == 0)
613 fsflags |= MNT_NOCLUSTERW;
614 else if (strcmp(opt->name, "clusterw") == 0) {
615 free(opt->name, M_MOUNT);
616 opt->name = strdup("nonoclusterw", M_MOUNT);
617 }
618 else if (strcmp(opt->name, "noexec") == 0)
619 fsflags |= MNT_NOEXEC;
620 else if (strcmp(opt->name, "exec") == 0) {
621 free(opt->name, M_MOUNT);
622 opt->name = strdup("nonoexec", M_MOUNT);
623 }
624 else if (strcmp(opt->name, "nosuid") == 0)
625 fsflags |= MNT_NOSUID;
626 else if (strcmp(opt->name, "suid") == 0) {
627 free(opt->name, M_MOUNT);
628 opt->name = strdup("nonosuid", M_MOUNT);
629 }
630 else if (strcmp(opt->name, "nosymfollow") == 0)
631 fsflags |= MNT_NOSYMFOLLOW;
632 else if (strcmp(opt->name, "symfollow") == 0) {
633 free(opt->name, M_MOUNT);
634 opt->name = strdup("nonosymfollow", M_MOUNT);
635 }
636 else if (strcmp(opt->name, "noro") == 0)
637 fsflags &= ~MNT_RDONLY;
638 else if (strcmp(opt->name, "rw") == 0)
639 fsflags &= ~MNT_RDONLY;
640 else if (strcmp(opt->name, "ro") == 0)
641 fsflags |= MNT_RDONLY;
642 else if (strcmp(opt->name, "rdonly") == 0) {
643 free(opt->name, M_MOUNT);
644 opt->name = strdup("ro", M_MOUNT);
645 fsflags |= MNT_RDONLY;
646 }
647 else if (strcmp(opt->name, "suiddir") == 0)
648 fsflags |= MNT_SUIDDIR;
649 else if (strcmp(opt->name, "sync") == 0)
650 fsflags |= MNT_SYNCHRONOUS;
651 else if (strcmp(opt->name, "union") == 0)
652 fsflags |= MNT_UNION;
653 else if (strcmp(opt->name, "automounted") == 0) {
654 fsflags |= MNT_AUTOMOUNTED;
655 vfs_freeopt(optlist, opt);
656 }
657 }
658
659 /*
660 * Be ultra-paranoid about making sure the type and fspath
661 * variables will fit in our mp buffers, including the
662 * terminating NUL.
663 */
664 if (fstypelen > MFSNAMELEN || fspathlen > MNAMELEN) {
665 error = ENAMETOOLONG;
666 goto bail;
667 }
668
669 error = vfs_domount(td, fstype, fspath, fsflags, &optlist);
670 bail:
671 /* copyout the errmsg */
672 if (errmsg_pos != -1 && ((2 * errmsg_pos + 1) < fsoptions->uio_iovcnt)
673 && errmsg_len > 0 && errmsg != NULL) {
674 if (fsoptions->uio_segflg == UIO_SYSSPACE) {
675 bcopy(errmsg,
676 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
677 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
678 } else {
679 copyout(errmsg,
680 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_base,
681 fsoptions->uio_iov[2 * errmsg_pos + 1].iov_len);
682 }
683 }
684
685 if (optlist != NULL)
686 vfs_freeopts(optlist);
687 return (error);
688 }
689
690 /*
691 * Old mount API.
692 */
693 #ifndef _SYS_SYSPROTO_H_
694 struct mount_args {
695 char *type;
696 char *path;
697 int flags;
698 caddr_t data;
699 };
700 #endif
701 /* ARGSUSED */
702 int
703 sys_mount(td, uap)
704 struct thread *td;
705 struct mount_args /* {
706 char *type;
707 char *path;
708 int flags;
709 caddr_t data;
710 } */ *uap;
711 {
712 char *fstype;
713 struct vfsconf *vfsp = NULL;
714 struct mntarg *ma = NULL;
715 uint64_t flags;
716 int error;
717
718 /*
719 * Mount flags are now 64-bits. On 32-bit architectures only
720 * 32-bits are passed in, but from here on everything handles
721 * 64-bit flags correctly.
722 */
723 flags = uap->flags;
724
725 AUDIT_ARG_FFLAGS(flags);
726
727 /*
728 * Filter out MNT_ROOTFS. We do not want clients of mount() in
729 * userspace to set this flag, but we must filter it out if we want
730 * MNT_UPDATE on the root file system to work.
731 * MNT_ROOTFS should only be set by the kernel when mounting its
732 * root file system.
733 */
734 flags &= ~MNT_ROOTFS;
735
736 fstype = malloc(MFSNAMELEN, M_TEMP, M_WAITOK);
737 error = copyinstr(uap->type, fstype, MFSNAMELEN, NULL);
738 if (error) {
739 free(fstype, M_TEMP);
740 return (error);
741 }
742
743 AUDIT_ARG_TEXT(fstype);
744 vfsp = vfs_byname_kld(fstype, td, &error);
745 free(fstype, M_TEMP);
746 if (vfsp == NULL)
747 return (ENOENT);
748 if (vfsp->vfc_vfsops->vfs_cmount == NULL)
749 return (EOPNOTSUPP);
750
751 ma = mount_argsu(ma, "fstype", uap->type, MFSNAMELEN);
752 ma = mount_argsu(ma, "fspath", uap->path, MNAMELEN);
753 ma = mount_argb(ma, flags & MNT_RDONLY, "noro");
754 ma = mount_argb(ma, !(flags & MNT_NOSUID), "nosuid");
755 ma = mount_argb(ma, !(flags & MNT_NOEXEC), "noexec");
756
757 error = vfsp->vfc_vfsops->vfs_cmount(ma, uap->data, flags);
758 return (error);
759 }
760
761 /*
762 * vfs_domount_first(): first file system mount (not update)
763 */
764 static int
765 vfs_domount_first(
766 struct thread *td, /* Calling thread. */
767 struct vfsconf *vfsp, /* File system type. */
768 char *fspath, /* Mount path. */
769 struct vnode *vp, /* Vnode to be covered. */
770 uint64_t fsflags, /* Flags common to all filesystems. */
771 struct vfsoptlist **optlist /* Options local to the filesystem. */
772 )
773 {
774 struct vattr va;
775 struct mount *mp;
776 struct vnode *newdp;
777 int error;
778
779 ASSERT_VOP_ELOCKED(vp, __func__);
780 KASSERT((fsflags & MNT_UPDATE) == 0, ("MNT_UPDATE shouldn't be here"));
781
782 /*
783 * If the user is not root, ensure that they own the directory
784 * onto which we are attempting to mount.
785 */
786 error = VOP_GETATTR(vp, &va, td->td_ucred);
787 if (error == 0 && va.va_uid != td->td_ucred->cr_uid)
788 error = priv_check_cred(td->td_ucred, PRIV_VFS_ADMIN, 0);
789 if (error == 0)
790 error = vinvalbuf(vp, V_SAVE, 0, 0);
791 if (error == 0 && vp->v_type != VDIR)
792 error = ENOTDIR;
793 if (error == 0) {
794 VI_LOCK(vp);
795 if ((vp->v_iflag & VI_MOUNT) == 0 && vp->v_mountedhere == NULL)
796 vp->v_iflag |= VI_MOUNT;
797 else
798 error = EBUSY;
799 VI_UNLOCK(vp);
800 }
801 if (error != 0) {
802 vput(vp);
803 return (error);
804 }
805 VOP_UNLOCK(vp, 0);
806
807 /* Allocate and initialize the filesystem. */
808 mp = vfs_mount_alloc(vp, vfsp, fspath, td->td_ucred);
809 /* XXXMAC: pass to vfs_mount_alloc? */
810 mp->mnt_optnew = *optlist;
811 /* Set the mount level flags. */
812 mp->mnt_flag = (fsflags & (MNT_UPDATEMASK | MNT_ROOTFS | MNT_RDONLY));
813
814 /*
815 * Mount the filesystem.
816 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
817 * get. No freeing of cn_pnbuf.
818 */
819 error = VFS_MOUNT(mp);
820 if (error != 0) {
821 vfs_unbusy(mp);
822 vfs_mount_destroy(mp);
823 VI_LOCK(vp);
824 vp->v_iflag &= ~VI_MOUNT;
825 VI_UNLOCK(vp);
826 vrele(vp);
827 return (error);
828 }
829
830 if (mp->mnt_opt != NULL)
831 vfs_freeopts(mp->mnt_opt);
832 mp->mnt_opt = mp->mnt_optnew;
833 *optlist = NULL;
834 (void)VFS_STATFS(mp, &mp->mnt_stat);
835
836 /*
837 * Prevent external consumers of mount options from reading mnt_optnew.
838 */
839 mp->mnt_optnew = NULL;
840
841 MNT_ILOCK(mp);
842 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
843 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
844 mp->mnt_kern_flag |= MNTK_ASYNC;
845 else
846 mp->mnt_kern_flag &= ~MNTK_ASYNC;
847 MNT_IUNLOCK(mp);
848
849 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
850 cache_purge(vp);
851 VI_LOCK(vp);
852 vp->v_iflag &= ~VI_MOUNT;
853 VI_UNLOCK(vp);
854 vp->v_mountedhere = mp;
855 /* Place the new filesystem at the end of the mount list. */
856 mtx_lock(&mountlist_mtx);
857 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
858 mtx_unlock(&mountlist_mtx);
859 vfs_event_signal(NULL, VQ_MOUNT, 0);
860 if (VFS_ROOT(mp, LK_EXCLUSIVE, &newdp))
861 panic("mount: lost mount");
862 VOP_UNLOCK(vp, 0);
863 EVENTHANDLER_INVOKE(vfs_mounted, mp, newdp, td);
864 VOP_UNLOCK(newdp, 0);
865 mountcheckdirs(vp, newdp);
866 vrele(newdp);
867 if ((mp->mnt_flag & MNT_RDONLY) == 0)
868 vfs_allocate_syncvnode(mp);
869 vfs_unbusy(mp);
870 return (0);
871 }
872
873 /*
874 * vfs_domount_update(): update of mounted file system
875 */
876 static int
877 vfs_domount_update(
878 struct thread *td, /* Calling thread. */
879 struct vnode *vp, /* Mount point vnode. */
880 uint64_t fsflags, /* Flags common to all filesystems. */
881 struct vfsoptlist **optlist /* Options local to the filesystem. */
882 )
883 {
884 struct export_args export;
885 void *bufp;
886 struct mount *mp;
887 int error, export_error, len;
888 uint64_t flag;
889
890 ASSERT_VOP_ELOCKED(vp, __func__);
891 KASSERT((fsflags & MNT_UPDATE) != 0, ("MNT_UPDATE should be here"));
892 mp = vp->v_mount;
893
894 if ((vp->v_vflag & VV_ROOT) == 0) {
895 if (vfs_copyopt(*optlist, "export", &export, sizeof(export))
896 == 0)
897 error = EXDEV;
898 else
899 error = EINVAL;
900 vput(vp);
901 return (error);
902 }
903
904 /*
905 * We only allow the filesystem to be reloaded if it
906 * is currently mounted read-only.
907 */
908 flag = mp->mnt_flag;
909 if ((fsflags & MNT_RELOAD) != 0 && (flag & MNT_RDONLY) == 0) {
910 vput(vp);
911 return (EOPNOTSUPP); /* Needs translation */
912 }
913 /*
914 * Only privileged root, or (if MNT_USER is set) the user that
915 * did the original mount is permitted to update it.
916 */
917 error = vfs_suser(mp, td);
918 if (error != 0) {
919 vput(vp);
920 return (error);
921 }
922 if (vfs_busy(mp, MBF_NOWAIT)) {
923 vput(vp);
924 return (EBUSY);
925 }
926 VI_LOCK(vp);
927 if ((vp->v_iflag & VI_MOUNT) != 0 || vp->v_mountedhere != NULL) {
928 VI_UNLOCK(vp);
929 vfs_unbusy(mp);
930 vput(vp);
931 return (EBUSY);
932 }
933 vp->v_iflag |= VI_MOUNT;
934 VI_UNLOCK(vp);
935 VOP_UNLOCK(vp, 0);
936
937 MNT_ILOCK(mp);
938 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0) {
939 MNT_IUNLOCK(mp);
940 error = EBUSY;
941 goto end;
942 }
943 mp->mnt_flag &= ~MNT_UPDATEMASK;
944 mp->mnt_flag |= fsflags & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE |
945 MNT_SNAPSHOT | MNT_ROOTFS | MNT_UPDATEMASK | MNT_RDONLY);
946 if ((mp->mnt_flag & MNT_ASYNC) == 0)
947 mp->mnt_kern_flag &= ~MNTK_ASYNC;
948 MNT_IUNLOCK(mp);
949 mp->mnt_optnew = *optlist;
950 vfs_mergeopts(mp->mnt_optnew, mp->mnt_opt);
951
952 /*
953 * Mount the filesystem.
954 * XXX The final recipients of VFS_MOUNT just overwrite the ndp they
955 * get. No freeing of cn_pnbuf.
956 */
957 error = VFS_MOUNT(mp);
958
959 export_error = 0;
960 /* Process the export option. */
961 if (error == 0 && vfs_getopt(mp->mnt_optnew, "export", &bufp,
962 &len) == 0) {
963 /* Assume that there is only 1 ABI for each length. */
964 switch (len) {
965 case (sizeof(struct oexport_args)):
966 bzero(&export, sizeof(export));
967 /* FALLTHROUGH */
968 case (sizeof(export)):
969 bcopy(bufp, &export, len);
970 export_error = vfs_export(mp, &export);
971 break;
972 default:
973 export_error = EINVAL;
974 break;
975 }
976 }
977
978 MNT_ILOCK(mp);
979 if (error == 0) {
980 mp->mnt_flag &= ~(MNT_UPDATE | MNT_RELOAD | MNT_FORCE |
981 MNT_SNAPSHOT);
982 } else {
983 /*
984 * If we fail, restore old mount flags. MNT_QUOTA is special,
985 * because it is not part of MNT_UPDATEMASK, but it could have
986 * changed in the meantime if quotactl(2) was called.
987 * All in all we want current value of MNT_QUOTA, not the old
988 * one.
989 */
990 mp->mnt_flag = (mp->mnt_flag & MNT_QUOTA) | (flag & ~MNT_QUOTA);
991 }
992 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
993 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
994 mp->mnt_kern_flag |= MNTK_ASYNC;
995 else
996 mp->mnt_kern_flag &= ~MNTK_ASYNC;
997 MNT_IUNLOCK(mp);
998
999 if (error != 0)
1000 goto end;
1001
1002 if (mp->mnt_opt != NULL)
1003 vfs_freeopts(mp->mnt_opt);
1004 mp->mnt_opt = mp->mnt_optnew;
1005 *optlist = NULL;
1006 (void)VFS_STATFS(mp, &mp->mnt_stat);
1007 /*
1008 * Prevent external consumers of mount options from reading
1009 * mnt_optnew.
1010 */
1011 mp->mnt_optnew = NULL;
1012
1013 if ((mp->mnt_flag & MNT_RDONLY) == 0)
1014 vfs_allocate_syncvnode(mp);
1015 else
1016 vfs_deallocate_syncvnode(mp);
1017 end:
1018 vfs_unbusy(mp);
1019 VI_LOCK(vp);
1020 vp->v_iflag &= ~VI_MOUNT;
1021 VI_UNLOCK(vp);
1022 vrele(vp);
1023 return (error != 0 ? error : export_error);
1024 }
1025
1026 /*
1027 * vfs_domount(): actually attempt a filesystem mount.
1028 */
1029 static int
1030 vfs_domount(
1031 struct thread *td, /* Calling thread. */
1032 const char *fstype, /* Filesystem type. */
1033 char *fspath, /* Mount path. */
1034 uint64_t fsflags, /* Flags common to all filesystems. */
1035 struct vfsoptlist **optlist /* Options local to the filesystem. */
1036 )
1037 {
1038 struct vfsconf *vfsp;
1039 struct nameidata nd;
1040 struct vnode *vp;
1041 char *pathbuf;
1042 int error;
1043
1044 /*
1045 * Be ultra-paranoid about making sure the type and fspath
1046 * variables will fit in our mp buffers, including the
1047 * terminating NUL.
1048 */
1049 if (strlen(fstype) >= MFSNAMELEN || strlen(fspath) >= MNAMELEN)
1050 return (ENAMETOOLONG);
1051
1052 if (jailed(td->td_ucred) || usermount == 0) {
1053 if ((error = priv_check(td, PRIV_VFS_MOUNT)) != 0)
1054 return (error);
1055 }
1056
1057 /*
1058 * Do not allow NFS export or MNT_SUIDDIR by unprivileged users.
1059 */
1060 if (fsflags & MNT_EXPORTED) {
1061 error = priv_check(td, PRIV_VFS_MOUNT_EXPORTED);
1062 if (error)
1063 return (error);
1064 }
1065 if (fsflags & MNT_SUIDDIR) {
1066 error = priv_check(td, PRIV_VFS_MOUNT_SUIDDIR);
1067 if (error)
1068 return (error);
1069 }
1070 /*
1071 * Silently enforce MNT_NOSUID and MNT_USER for unprivileged users.
1072 */
1073 if ((fsflags & (MNT_NOSUID | MNT_USER)) != (MNT_NOSUID | MNT_USER)) {
1074 if (priv_check(td, PRIV_VFS_MOUNT_NONUSER) != 0)
1075 fsflags |= MNT_NOSUID | MNT_USER;
1076 }
1077
1078 /* Load KLDs before we lock the covered vnode to avoid reversals. */
1079 vfsp = NULL;
1080 if ((fsflags & MNT_UPDATE) == 0) {
1081 /* Don't try to load KLDs if we're mounting the root. */
1082 if (fsflags & MNT_ROOTFS)
1083 vfsp = vfs_byname(fstype);
1084 else
1085 vfsp = vfs_byname_kld(fstype, td, &error);
1086 if (vfsp == NULL)
1087 return (ENODEV);
1088 if (jailed(td->td_ucred) && !(vfsp->vfc_flags & VFCF_JAIL))
1089 return (EPERM);
1090 }
1091
1092 /*
1093 * Get vnode to be covered or mount point's vnode in case of MNT_UPDATE.
1094 */
1095 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1,
1096 UIO_SYSSPACE, fspath, td);
1097 error = namei(&nd);
1098 if (error != 0)
1099 return (error);
1100 NDFREE(&nd, NDF_ONLY_PNBUF);
1101 vp = nd.ni_vp;
1102 if ((fsflags & MNT_UPDATE) == 0) {
1103 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1104 strcpy(pathbuf, fspath);
1105 error = vn_path_to_global_path(td, vp, pathbuf, MNAMELEN);
1106 /* debug.disablefullpath == 1 results in ENODEV */
1107 if (error == 0 || error == ENODEV) {
1108 error = vfs_domount_first(td, vfsp, pathbuf, vp,
1109 fsflags, optlist);
1110 }
1111 free(pathbuf, M_TEMP);
1112 } else
1113 error = vfs_domount_update(td, vp, fsflags, optlist);
1114
1115 return (error);
1116 }
1117
1118 /*
1119 * Unmount a filesystem.
1120 *
1121 * Note: unmount takes a path to the vnode mounted on as argument, not
1122 * special file (as before).
1123 */
1124 #ifndef _SYS_SYSPROTO_H_
1125 struct unmount_args {
1126 char *path;
1127 int flags;
1128 };
1129 #endif
1130 /* ARGSUSED */
1131 int
1132 sys_unmount(struct thread *td, struct unmount_args *uap)
1133 {
1134 struct nameidata nd;
1135 struct mount *mp;
1136 char *pathbuf;
1137 int error, id0, id1;
1138
1139 AUDIT_ARG_VALUE(uap->flags);
1140 if (jailed(td->td_ucred) || usermount == 0) {
1141 error = priv_check(td, PRIV_VFS_UNMOUNT);
1142 if (error)
1143 return (error);
1144 }
1145
1146 pathbuf = malloc(MNAMELEN, M_TEMP, M_WAITOK);
1147 error = copyinstr(uap->path, pathbuf, MNAMELEN, NULL);
1148 if (error) {
1149 free(pathbuf, M_TEMP);
1150 return (error);
1151 }
1152 if (uap->flags & MNT_BYFSID) {
1153 AUDIT_ARG_TEXT(pathbuf);
1154 /* Decode the filesystem ID. */
1155 if (sscanf(pathbuf, "FSID:%d:%d", &id0, &id1) != 2) {
1156 free(pathbuf, M_TEMP);
1157 return (EINVAL);
1158 }
1159
1160 mtx_lock(&mountlist_mtx);
1161 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1162 if (mp->mnt_stat.f_fsid.val[0] == id0 &&
1163 mp->mnt_stat.f_fsid.val[1] == id1) {
1164 vfs_ref(mp);
1165 break;
1166 }
1167 }
1168 mtx_unlock(&mountlist_mtx);
1169 } else {
1170 /*
1171 * Try to find global path for path argument.
1172 */
1173 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1,
1174 UIO_SYSSPACE, pathbuf, td);
1175 if (namei(&nd) == 0) {
1176 NDFREE(&nd, NDF_ONLY_PNBUF);
1177 error = vn_path_to_global_path(td, nd.ni_vp, pathbuf,
1178 MNAMELEN);
1179 if (error == 0 || error == ENODEV)
1180 vput(nd.ni_vp);
1181 }
1182 mtx_lock(&mountlist_mtx);
1183 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) {
1184 if (strcmp(mp->mnt_stat.f_mntonname, pathbuf) == 0) {
1185 vfs_ref(mp);
1186 break;
1187 }
1188 }
1189 mtx_unlock(&mountlist_mtx);
1190 }
1191 free(pathbuf, M_TEMP);
1192 if (mp == NULL) {
1193 /*
1194 * Previously we returned ENOENT for a nonexistent path and
1195 * EINVAL for a non-mountpoint. We cannot tell these apart
1196 * now, so in the !MNT_BYFSID case return the more likely
1197 * EINVAL for compatibility.
1198 */
1199 return ((uap->flags & MNT_BYFSID) ? ENOENT : EINVAL);
1200 }
1201
1202 /*
1203 * Don't allow unmounting the root filesystem.
1204 */
1205 if (mp->mnt_flag & MNT_ROOTFS) {
1206 vfs_rel(mp);
1207 return (EINVAL);
1208 }
1209 error = dounmount(mp, uap->flags, td);
1210 return (error);
1211 }
1212
1213 /*
1214 * Return error if any of the vnodes, ignoring the root vnode
1215 * and the syncer vnode, have non-zero usecount.
1216 *
1217 * This function is purely advisory - it can return false positives
1218 * and negatives.
1219 */
1220 static int
1221 vfs_check_usecounts(struct mount *mp)
1222 {
1223 struct vnode *vp, *mvp;
1224
1225 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) {
1226 if ((vp->v_vflag & VV_ROOT) == 0 && vp->v_type != VNON &&
1227 vp->v_usecount != 0) {
1228 VI_UNLOCK(vp);
1229 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp);
1230 return (EBUSY);
1231 }
1232 VI_UNLOCK(vp);
1233 }
1234
1235 return (0);
1236 }
1237
1238 static void
1239 dounmount_cleanup(struct mount *mp, struct vnode *coveredvp, int mntkflags)
1240 {
1241
1242 mtx_assert(MNT_MTX(mp), MA_OWNED);
1243 mp->mnt_kern_flag &= ~mntkflags;
1244 if ((mp->mnt_kern_flag & MNTK_MWAIT) != 0) {
1245 mp->mnt_kern_flag &= ~MNTK_MWAIT;
1246 wakeup(mp);
1247 }
1248 MNT_IUNLOCK(mp);
1249 if (coveredvp != NULL) {
1250 VOP_UNLOCK(coveredvp, 0);
1251 vdrop(coveredvp);
1252 }
1253 vn_finished_write(mp);
1254 }
1255
1256 /*
1257 * Do the actual filesystem unmount.
1258 */
1259 int
1260 dounmount(struct mount *mp, int flags, struct thread *td)
1261 {
1262 struct vnode *coveredvp, *fsrootvp;
1263 int error;
1264 uint64_t async_flag;
1265 int mnt_gen_r;
1266
1267 if ((coveredvp = mp->mnt_vnodecovered) != NULL) {
1268 mnt_gen_r = mp->mnt_gen;
1269 VI_LOCK(coveredvp);
1270 vholdl(coveredvp);
1271 vn_lock(coveredvp, LK_EXCLUSIVE | LK_INTERLOCK | LK_RETRY);
1272 /*
1273 * Check for mp being unmounted while waiting for the
1274 * covered vnode lock.
1275 */
1276 if (coveredvp->v_mountedhere != mp ||
1277 coveredvp->v_mountedhere->mnt_gen != mnt_gen_r) {
1278 VOP_UNLOCK(coveredvp, 0);
1279 vdrop(coveredvp);
1280 vfs_rel(mp);
1281 return (EBUSY);
1282 }
1283 }
1284
1285 /*
1286 * Only privileged root, or (if MNT_USER is set) the user that did the
1287 * original mount is permitted to unmount this filesystem.
1288 */
1289 error = vfs_suser(mp, td);
1290 if (error != 0) {
1291 if (coveredvp != NULL) {
1292 VOP_UNLOCK(coveredvp, 0);
1293 vdrop(coveredvp);
1294 }
1295 vfs_rel(mp);
1296 return (error);
1297 }
1298
1299 vn_start_write(NULL, &mp, V_WAIT | V_MNTREF);
1300 MNT_ILOCK(mp);
1301 if ((mp->mnt_kern_flag & MNTK_UNMOUNT) != 0 ||
1302 (mp->mnt_flag & MNT_UPDATE) != 0 ||
1303 !TAILQ_EMPTY(&mp->mnt_uppers)) {
1304 dounmount_cleanup(mp, coveredvp, 0);
1305 return (EBUSY);
1306 }
1307 mp->mnt_kern_flag |= MNTK_UNMOUNT | MNTK_NOINSMNTQ;
1308 if (flags & MNT_NONBUSY) {
1309 MNT_IUNLOCK(mp);
1310 error = vfs_check_usecounts(mp);
1311 MNT_ILOCK(mp);
1312 if (error != 0) {
1313 dounmount_cleanup(mp, coveredvp, MNTK_UNMOUNT |
1314 MNTK_NOINSMNTQ);
1315 return (error);
1316 }
1317 }
1318 /* Allow filesystems to detect that a forced unmount is in progress. */
1319 if (flags & MNT_FORCE) {
1320 mp->mnt_kern_flag |= MNTK_UNMOUNTF;
1321 MNT_IUNLOCK(mp);
1322 /*
1323 * Must be done after setting MNTK_UNMOUNTF and before
1324 * waiting for mnt_lockref to become 0.
1325 */
1326 VFS_PURGE(mp);
1327 MNT_ILOCK(mp);
1328 }
1329 error = 0;
1330 if (mp->mnt_lockref) {
1331 mp->mnt_kern_flag |= MNTK_DRAINING;
1332 error = msleep(&mp->mnt_lockref, MNT_MTX(mp), PVFS,
1333 "mount drain", 0);
1334 }
1335 MNT_IUNLOCK(mp);
1336 KASSERT(mp->mnt_lockref == 0,
1337 ("%s: invalid lock refcount in the drain path @ %s:%d",
1338 __func__, __FILE__, __LINE__));
1339 KASSERT(error == 0,
1340 ("%s: invalid return value for msleep in the drain path @ %s:%d",
1341 __func__, __FILE__, __LINE__));
1342
1343 if (mp->mnt_flag & MNT_EXPUBLIC)
1344 vfs_setpublicfs(NULL, NULL, NULL);
1345
1346 /*
1347 * From now, we can claim that the use reference on the
1348 * coveredvp is ours, and the ref can be released only by
1349 * successfull unmount by us, or left for later unmount
1350 * attempt. The previously acquired hold reference is no
1351 * longer needed to protect the vnode from reuse.
1352 */
1353 if (coveredvp != NULL)
1354 vdrop(coveredvp);
1355
1356 vfs_msync(mp, MNT_WAIT);
1357 MNT_ILOCK(mp);
1358 async_flag = mp->mnt_flag & MNT_ASYNC;
1359 mp->mnt_flag &= ~MNT_ASYNC;
1360 mp->mnt_kern_flag &= ~MNTK_ASYNC;
1361 MNT_IUNLOCK(mp);
1362 cache_purgevfs(mp, false); /* remove cache entries for this file sys */
1363 vfs_deallocate_syncvnode(mp);
1364 /*
1365 * For forced unmounts, move process cdir/rdir refs on the fs root
1366 * vnode to the covered vnode. For non-forced unmounts we want
1367 * such references to cause an EBUSY error.
1368 */
1369 if ((flags & MNT_FORCE) &&
1370 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) {
1371 if (mp->mnt_vnodecovered != NULL &&
1372 (mp->mnt_flag & MNT_IGNORE) == 0)
1373 mountcheckdirs(fsrootvp, mp->mnt_vnodecovered);
1374 if (fsrootvp == rootvnode) {
1375 vrele(rootvnode);
1376 rootvnode = NULL;
1377 }
1378 vput(fsrootvp);
1379 }
1380 if ((mp->mnt_flag & MNT_RDONLY) != 0 || (flags & MNT_FORCE) != 0 ||
1381 (error = VFS_SYNC(mp, MNT_WAIT)) == 0)
1382 error = VFS_UNMOUNT(mp, flags);
1383 vn_finished_write(mp);
1384 /*
1385 * If we failed to flush the dirty blocks for this mount point,
1386 * undo all the cdir/rdir and rootvnode changes we made above.
1387 * Unless we failed to do so because the device is reporting that
1388 * it doesn't exist anymore.
1389 */
1390 if (error && error != ENXIO) {
1391 if ((flags & MNT_FORCE) &&
1392 VFS_ROOT(mp, LK_EXCLUSIVE, &fsrootvp) == 0) {
1393 if (mp->mnt_vnodecovered != NULL &&
1394 (mp->mnt_flag & MNT_IGNORE) == 0)
1395 mountcheckdirs(mp->mnt_vnodecovered, fsrootvp);
1396 if (rootvnode == NULL) {
1397 rootvnode = fsrootvp;
1398 vref(rootvnode);
1399 }
1400 vput(fsrootvp);
1401 }
1402 MNT_ILOCK(mp);
1403 mp->mnt_kern_flag &= ~MNTK_NOINSMNTQ;
1404 if ((mp->mnt_flag & MNT_RDONLY) == 0) {
1405 MNT_IUNLOCK(mp);
1406 vfs_allocate_syncvnode(mp);
1407 MNT_ILOCK(mp);
1408 }
1409 mp->mnt_kern_flag &= ~(MNTK_UNMOUNT | MNTK_UNMOUNTF);
1410 mp->mnt_flag |= async_flag;
1411 if ((mp->mnt_flag & MNT_ASYNC) != 0 &&
1412 (mp->mnt_kern_flag & MNTK_NOASYNC) == 0)
1413 mp->mnt_kern_flag |= MNTK_ASYNC;
1414 if (mp->mnt_kern_flag & MNTK_MWAIT) {
1415 mp->mnt_kern_flag &= ~MNTK_MWAIT;
1416 wakeup(mp);
1417 }
1418 MNT_IUNLOCK(mp);
1419 if (coveredvp)
1420 VOP_UNLOCK(coveredvp, 0);
1421 return (error);
1422 }
1423 mtx_lock(&mountlist_mtx);
1424 TAILQ_REMOVE(&mountlist, mp, mnt_list);
1425 mtx_unlock(&mountlist_mtx);
1426 EVENTHANDLER_INVOKE(vfs_unmounted, mp, td);
1427 if (coveredvp != NULL) {
1428 coveredvp->v_mountedhere = NULL;
1429 vput(coveredvp);
1430 }
1431 vfs_event_signal(NULL, VQ_UNMOUNT, 0);
1432 if (mp == rootdevmp)
1433 rootdevmp = NULL;
1434 vfs_mount_destroy(mp);
1435 return (0);
1436 }
1437
1438 /*
1439 * Report errors during filesystem mounting.
1440 */
1441 void
1442 vfs_mount_error(struct mount *mp, const char *fmt, ...)
1443 {
1444 struct vfsoptlist *moptlist = mp->mnt_optnew;
1445 va_list ap;
1446 int error, len;
1447 char *errmsg;
1448
1449 error = vfs_getopt(moptlist, "errmsg", (void **)&errmsg, &len);
1450 if (error || errmsg == NULL || len <= 0)
1451 return;
1452
1453 va_start(ap, fmt);
1454 vsnprintf(errmsg, (size_t)len, fmt, ap);
1455 va_end(ap);
1456 }
1457
1458 void
1459 vfs_opterror(struct vfsoptlist *opts, const char *fmt, ...)
1460 {
1461 va_list ap;
1462 int error, len;
1463 char *errmsg;
1464
1465 error = vfs_getopt(opts, "errmsg", (void **)&errmsg, &len);
1466 if (error || errmsg == NULL || len <= 0)
1467 return;
1468
1469 va_start(ap, fmt);
1470 vsnprintf(errmsg, (size_t)len, fmt, ap);
1471 va_end(ap);
1472 }
1473
1474 /*
1475 * ---------------------------------------------------------------------
1476 * Functions for querying mount options/arguments from filesystems.
1477 */
1478
1479 /*
1480 * Check that no unknown options are given
1481 */
1482 int
1483 vfs_filteropt(struct vfsoptlist *opts, const char **legal)
1484 {
1485 struct vfsopt *opt;
1486 char errmsg[255];
1487 const char **t, *p, *q;
1488 int ret = 0;
1489
1490 TAILQ_FOREACH(opt, opts, link) {
1491 p = opt->name;
1492 q = NULL;
1493 if (p[0] == 'n' && p[1] == 'o')
1494 q = p + 2;
1495 for(t = global_opts; *t != NULL; t++) {
1496 if (strcmp(*t, p) == 0)
1497 break;
1498 if (q != NULL) {
1499 if (strcmp(*t, q) == 0)
1500 break;
1501 }
1502 }
1503 if (*t != NULL)
1504 continue;
1505 for(t = legal; *t != NULL; t++) {
1506 if (strcmp(*t, p) == 0)
1507 break;
1508 if (q != NULL) {
1509 if (strcmp(*t, q) == 0)
1510 break;
1511 }
1512 }
1513 if (*t != NULL)
1514 continue;
1515 snprintf(errmsg, sizeof(errmsg),
1516 "mount option <%s> is unknown", p);
1517 ret = EINVAL;
1518 }
1519 if (ret != 0) {
1520 TAILQ_FOREACH(opt, opts, link) {
1521 if (strcmp(opt->name, "errmsg") == 0) {
1522 strncpy((char *)opt->value, errmsg, opt->len);
1523 break;
1524 }
1525 }
1526 if (opt == NULL)
1527 printf("%s\n", errmsg);
1528 }
1529 return (ret);
1530 }
1531
1532 /*
1533 * Get a mount option by its name.
1534 *
1535 * Return 0 if the option was found, ENOENT otherwise.
1536 * If len is non-NULL it will be filled with the length
1537 * of the option. If buf is non-NULL, it will be filled
1538 * with the address of the option.
1539 */
1540 int
1541 vfs_getopt(opts, name, buf, len)
1542 struct vfsoptlist *opts;
1543 const char *name;
1544 void **buf;
1545 int *len;
1546 {
1547 struct vfsopt *opt;
1548
1549 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1550
1551 TAILQ_FOREACH(opt, opts, link) {
1552 if (strcmp(name, opt->name) == 0) {
1553 opt->seen = 1;
1554 if (len != NULL)
1555 *len = opt->len;
1556 if (buf != NULL)
1557 *buf = opt->value;
1558 return (0);
1559 }
1560 }
1561 return (ENOENT);
1562 }
1563
1564 int
1565 vfs_getopt_pos(struct vfsoptlist *opts, const char *name)
1566 {
1567 struct vfsopt *opt;
1568
1569 if (opts == NULL)
1570 return (-1);
1571
1572 TAILQ_FOREACH(opt, opts, link) {
1573 if (strcmp(name, opt->name) == 0) {
1574 opt->seen = 1;
1575 return (opt->pos);
1576 }
1577 }
1578 return (-1);
1579 }
1580
1581 int
1582 vfs_getopt_size(struct vfsoptlist *opts, const char *name, off_t *value)
1583 {
1584 char *opt_value, *vtp;
1585 quad_t iv;
1586 int error, opt_len;
1587
1588 error = vfs_getopt(opts, name, (void **)&opt_value, &opt_len);
1589 if (error != 0)
1590 return (error);
1591 if (opt_len == 0 || opt_value == NULL)
1592 return (EINVAL);
1593 if (opt_value[0] == '\0' || opt_value[opt_len - 1] != '\0')
1594 return (EINVAL);
1595 iv = strtoq(opt_value, &vtp, 0);
1596 if (vtp == opt_value || (vtp[0] != '\0' && vtp[1] != '\0'))
1597 return (EINVAL);
1598 if (iv < 0)
1599 return (EINVAL);
1600 switch (vtp[0]) {
1601 case 't':
1602 case 'T':
1603 iv *= 1024;
1604 case 'g':
1605 case 'G':
1606 iv *= 1024;
1607 case 'm':
1608 case 'M':
1609 iv *= 1024;
1610 case 'k':
1611 case 'K':
1612 iv *= 1024;
1613 case '\0':
1614 break;
1615 default:
1616 return (EINVAL);
1617 }
1618 *value = iv;
1619
1620 return (0);
1621 }
1622
1623 char *
1624 vfs_getopts(struct vfsoptlist *opts, const char *name, int *error)
1625 {
1626 struct vfsopt *opt;
1627
1628 *error = 0;
1629 TAILQ_FOREACH(opt, opts, link) {
1630 if (strcmp(name, opt->name) != 0)
1631 continue;
1632 opt->seen = 1;
1633 if (opt->len == 0 ||
1634 ((char *)opt->value)[opt->len - 1] != '\0') {
1635 *error = EINVAL;
1636 return (NULL);
1637 }
1638 return (opt->value);
1639 }
1640 *error = ENOENT;
1641 return (NULL);
1642 }
1643
1644 int
1645 vfs_flagopt(struct vfsoptlist *opts, const char *name, uint64_t *w,
1646 uint64_t val)
1647 {
1648 struct vfsopt *opt;
1649
1650 TAILQ_FOREACH(opt, opts, link) {
1651 if (strcmp(name, opt->name) == 0) {
1652 opt->seen = 1;
1653 if (w != NULL)
1654 *w |= val;
1655 return (1);
1656 }
1657 }
1658 if (w != NULL)
1659 *w &= ~val;
1660 return (0);
1661 }
1662
1663 int
1664 vfs_scanopt(struct vfsoptlist *opts, const char *name, const char *fmt, ...)
1665 {
1666 va_list ap;
1667 struct vfsopt *opt;
1668 int ret;
1669
1670 KASSERT(opts != NULL, ("vfs_getopt: caller passed 'opts' as NULL"));
1671
1672 TAILQ_FOREACH(opt, opts, link) {
1673 if (strcmp(name, opt->name) != 0)
1674 continue;
1675 opt->seen = 1;
1676 if (opt->len == 0 || opt->value == NULL)
1677 return (0);
1678 if (((char *)opt->value)[opt->len - 1] != '\0')
1679 return (0);
1680 va_start(ap, fmt);
1681 ret = vsscanf(opt->value, fmt, ap);
1682 va_end(ap);
1683 return (ret);
1684 }
1685 return (0);
1686 }
1687
1688 int
1689 vfs_setopt(struct vfsoptlist *opts, const char *name, void *value, int len)
1690 {
1691 struct vfsopt *opt;
1692
1693 TAILQ_FOREACH(opt, opts, link) {
1694 if (strcmp(name, opt->name) != 0)
1695 continue;
1696 opt->seen = 1;
1697 if (opt->value == NULL)
1698 opt->len = len;
1699 else {
1700 if (opt->len != len)
1701 return (EINVAL);
1702 bcopy(value, opt->value, len);
1703 }
1704 return (0);
1705 }
1706 return (ENOENT);
1707 }
1708
1709 int
1710 vfs_setopt_part(struct vfsoptlist *opts, const char *name, void *value, int len)
1711 {
1712 struct vfsopt *opt;
1713
1714 TAILQ_FOREACH(opt, opts, link) {
1715 if (strcmp(name, opt->name) != 0)
1716 continue;
1717 opt->seen = 1;
1718 if (opt->value == NULL)
1719 opt->len = len;
1720 else {
1721 if (opt->len < len)
1722 return (EINVAL);
1723 opt->len = len;
1724 bcopy(value, opt->value, len);
1725 }
1726 return (0);
1727 }
1728 return (ENOENT);
1729 }
1730
1731 int
1732 vfs_setopts(struct vfsoptlist *opts, const char *name, const char *value)
1733 {
1734 struct vfsopt *opt;
1735
1736 TAILQ_FOREACH(opt, opts, link) {
1737 if (strcmp(name, opt->name) != 0)
1738 continue;
1739 opt->seen = 1;
1740 if (opt->value == NULL)
1741 opt->len = strlen(value) + 1;
1742 else if (strlcpy(opt->value, value, opt->len) >= opt->len)
1743 return (EINVAL);
1744 return (0);
1745 }
1746 return (ENOENT);
1747 }
1748
1749 /*
1750 * Find and copy a mount option.
1751 *
1752 * The size of the buffer has to be specified
1753 * in len, if it is not the same length as the
1754 * mount option, EINVAL is returned.
1755 * Returns ENOENT if the option is not found.
1756 */
1757 int
1758 vfs_copyopt(opts, name, dest, len)
1759 struct vfsoptlist *opts;
1760 const char *name;
1761 void *dest;
1762 int len;
1763 {
1764 struct vfsopt *opt;
1765
1766 KASSERT(opts != NULL, ("vfs_copyopt: caller passed 'opts' as NULL"));
1767
1768 TAILQ_FOREACH(opt, opts, link) {
1769 if (strcmp(name, opt->name) == 0) {
1770 opt->seen = 1;
1771 if (len != opt->len)
1772 return (EINVAL);
1773 bcopy(opt->value, dest, opt->len);
1774 return (0);
1775 }
1776 }
1777 return (ENOENT);
1778 }
1779
1780 int
1781 __vfs_statfs(struct mount *mp, struct statfs *sbp)
1782 {
1783 int error;
1784
1785 error = mp->mnt_op->vfs_statfs(mp, &mp->mnt_stat);
1786 if (sbp != &mp->mnt_stat)
1787 *sbp = mp->mnt_stat;
1788 return (error);
1789 }
1790
1791 void
1792 vfs_mountedfrom(struct mount *mp, const char *from)
1793 {
1794
1795 bzero(mp->mnt_stat.f_mntfromname, sizeof mp->mnt_stat.f_mntfromname);
1796 strlcpy(mp->mnt_stat.f_mntfromname, from,
1797 sizeof mp->mnt_stat.f_mntfromname);
1798 }
1799
1800 /*
1801 * ---------------------------------------------------------------------
1802 * This is the api for building mount args and mounting filesystems from
1803 * inside the kernel.
1804 *
1805 * The API works by accumulation of individual args. First error is
1806 * latched.
1807 *
1808 * XXX: should be documented in new manpage kernel_mount(9)
1809 */
1810
1811 /* A memory allocation which must be freed when we are done */
1812 struct mntaarg {
1813 SLIST_ENTRY(mntaarg) next;
1814 };
1815
1816 /* The header for the mount arguments */
1817 struct mntarg {
1818 struct iovec *v;
1819 int len;
1820 int error;
1821 SLIST_HEAD(, mntaarg) list;
1822 };
1823
1824 /*
1825 * Add a boolean argument.
1826 *
1827 * flag is the boolean value.
1828 * name must start with "no".
1829 */
1830 struct mntarg *
1831 mount_argb(struct mntarg *ma, int flag, const char *name)
1832 {
1833
1834 KASSERT(name[0] == 'n' && name[1] == 'o',
1835 ("mount_argb(...,%s): name must start with 'no'", name));
1836
1837 return (mount_arg(ma, name + (flag ? 2 : 0), NULL, 0));
1838 }
1839
1840 /*
1841 * Add an argument printf style
1842 */
1843 struct mntarg *
1844 mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...)
1845 {
1846 va_list ap;
1847 struct mntaarg *maa;
1848 struct sbuf *sb;
1849 int len;
1850
1851 if (ma == NULL) {
1852 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1853 SLIST_INIT(&ma->list);
1854 }
1855 if (ma->error)
1856 return (ma);
1857
1858 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
1859 M_MOUNT, M_WAITOK);
1860 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
1861 ma->v[ma->len].iov_len = strlen(name) + 1;
1862 ma->len++;
1863
1864 sb = sbuf_new_auto();
1865 va_start(ap, fmt);
1866 sbuf_vprintf(sb, fmt, ap);
1867 va_end(ap);
1868 sbuf_finish(sb);
1869 len = sbuf_len(sb) + 1;
1870 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
1871 SLIST_INSERT_HEAD(&ma->list, maa, next);
1872 bcopy(sbuf_data(sb), maa + 1, len);
1873 sbuf_delete(sb);
1874
1875 ma->v[ma->len].iov_base = maa + 1;
1876 ma->v[ma->len].iov_len = len;
1877 ma->len++;
1878
1879 return (ma);
1880 }
1881
1882 /*
1883 * Add an argument which is a userland string.
1884 */
1885 struct mntarg *
1886 mount_argsu(struct mntarg *ma, const char *name, const void *val, int len)
1887 {
1888 struct mntaarg *maa;
1889 char *tbuf;
1890
1891 if (val == NULL)
1892 return (ma);
1893 if (ma == NULL) {
1894 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1895 SLIST_INIT(&ma->list);
1896 }
1897 if (ma->error)
1898 return (ma);
1899 maa = malloc(sizeof *maa + len, M_MOUNT, M_WAITOK | M_ZERO);
1900 SLIST_INSERT_HEAD(&ma->list, maa, next);
1901 tbuf = (void *)(maa + 1);
1902 ma->error = copyinstr(val, tbuf, len, NULL);
1903 return (mount_arg(ma, name, tbuf, -1));
1904 }
1905
1906 /*
1907 * Plain argument.
1908 *
1909 * If length is -1, treat value as a C string.
1910 */
1911 struct mntarg *
1912 mount_arg(struct mntarg *ma, const char *name, const void *val, int len)
1913 {
1914
1915 if (ma == NULL) {
1916 ma = malloc(sizeof *ma, M_MOUNT, M_WAITOK | M_ZERO);
1917 SLIST_INIT(&ma->list);
1918 }
1919 if (ma->error)
1920 return (ma);
1921
1922 ma->v = realloc(ma->v, sizeof *ma->v * (ma->len + 2),
1923 M_MOUNT, M_WAITOK);
1924 ma->v[ma->len].iov_base = (void *)(uintptr_t)name;
1925 ma->v[ma->len].iov_len = strlen(name) + 1;
1926 ma->len++;
1927
1928 ma->v[ma->len].iov_base = (void *)(uintptr_t)val;
1929 if (len < 0)
1930 ma->v[ma->len].iov_len = strlen(val) + 1;
1931 else
1932 ma->v[ma->len].iov_len = len;
1933 ma->len++;
1934 return (ma);
1935 }
1936
1937 /*
1938 * Free a mntarg structure
1939 */
1940 static void
1941 free_mntarg(struct mntarg *ma)
1942 {
1943 struct mntaarg *maa;
1944
1945 while (!SLIST_EMPTY(&ma->list)) {
1946 maa = SLIST_FIRST(&ma->list);
1947 SLIST_REMOVE_HEAD(&ma->list, next);
1948 free(maa, M_MOUNT);
1949 }
1950 free(ma->v, M_MOUNT);
1951 free(ma, M_MOUNT);
1952 }
1953
1954 /*
1955 * Mount a filesystem
1956 */
1957 int
1958 kernel_mount(struct mntarg *ma, uint64_t flags)
1959 {
1960 struct uio auio;
1961 int error;
1962
1963 KASSERT(ma != NULL, ("kernel_mount NULL ma"));
1964 KASSERT(ma->v != NULL, ("kernel_mount NULL ma->v"));
1965 KASSERT(!(ma->len & 1), ("kernel_mount odd ma->len (%d)", ma->len));
1966
1967 auio.uio_iov = ma->v;
1968 auio.uio_iovcnt = ma->len;
1969 auio.uio_segflg = UIO_SYSSPACE;
1970
1971 error = ma->error;
1972 if (!error)
1973 error = vfs_donmount(curthread, flags, &auio);
1974 free_mntarg(ma);
1975 return (error);
1976 }
1977
1978 /*
1979 * A printflike function to mount a filesystem.
1980 */
1981 int
1982 kernel_vmount(int flags, ...)
1983 {
1984 struct mntarg *ma = NULL;
1985 va_list ap;
1986 const char *cp;
1987 const void *vp;
1988 int error;
1989
1990 va_start(ap, flags);
1991 for (;;) {
1992 cp = va_arg(ap, const char *);
1993 if (cp == NULL)
1994 break;
1995 vp = va_arg(ap, const void *);
1996 ma = mount_arg(ma, cp, vp, (vp != NULL ? -1 : 0));
1997 }
1998 va_end(ap);
1999
2000 error = kernel_mount(ma, flags);
2001 return (error);
2002 }
2003
2004 void
2005 vfs_oexport_conv(const struct oexport_args *oexp, struct export_args *exp)
2006 {
2007
2008 bcopy(oexp, exp, sizeof(*oexp));
2009 exp->ex_numsecflavors = 0;
2010 }
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